Waves Test - 36...

Mark the incorrect statement

'S' waves are

For the travelling harmonic wave  $$y(x,t)=2.0 cos $$ $$ 2\pi $$ (10t-0.0080 x+0.35 ) where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of $$x$$

The displacement of a particle performing simple harmonic motion is given by, $$x=8\sin { \omega t } +6\cos { \omega t } $$, where distance is in $$cm$$ and time is in second. The amplitude of motion is:

A particle is vibrating simple harmonically with an amplitude $$a$$. The displacement of the particle when its energy is half kinetic and half potential.

Nowadays, a lot of technological advancement has occurred and attempts are made to make system more efficient. Sound from High Tech phones do not exhibit reverberation. What could be the reason?

The displacement equation of a simple harmonic oscillator is given by
$$A\sin { \omega t-B\cos { \omega t }  } $$
The amplitude of the oscillator will be :

Two strings with mass per unit length of $$25\ g/cm$$ and $$9\ g/cm$$ are joined together in series. The reflection coefficient for the vibration waves are

A long spring whose one end is fixed is stretched from the other end and the left longitudinal waves of frequency $$500 Hz$$ are produced. If the velocity of wave is $$250 m/s$$. Find the distance between two consecutive compression and rarefaction :

Mark the correct statement: 

I) Directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface 

II) Reflection of sound occurs from a polished surface 

III) Reflection of sound occurs from a rough surface